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    <center>Scilab Function</center>
    <div align="right">Last update : April 1993</div>
    <p>
      <b>trfmod</b> -  poles and zeros display</p>
    <h3>
      <font color="blue">Calling Sequence</font>
    </h3>
    <dl>
      <dd>
        <tt>[hm]=trfmod(h [,job])  </tt>
      </dd>
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    <h3>
      <font color="blue">Description</font>
    </h3>
    <p>
    To visualize the pole-zero structure of a SISO transfer 
    function <tt>
        <b>h</b>
      </tt> .
  </p>
    <dl>
      <dd>
        <b>job='p'</b>: visualization of polynomials (default)</dd>
      <dd>
        <b>job='f'</b>: visualization of natural frequencies and damping</dd>
    </dl>
    <p>
    Interactive simplification of <tt>
        <b>h</b>
      </tt>. <tt>
        <b>trfmod</b>
      </tt> opens
    a dialog window.</p>
    <h3>
      <font color="blue">See Also</font>
    </h3>
    <p>
      <a href="../programming/poly.htm">
        <tt>
          <b>poly</b>
        </tt>
      </a>,&nbsp;&nbsp;<a href="../polynomials/simp.htm">
        <tt>
          <b>simp</b>
        </tt>
      </a>,&nbsp;&nbsp;</p>
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